OK. That's as I suspected.
My first point is that every training run should have a purpose. What is the purpose of running 13.1miles at race pace?
Second point is that every training run should leave you with enough energy to benefit from the next run.
Running 13.1miles at race pace (if done properly) will leave you exhausted and unable to train properly for 10-15 days afterwards.Fairly pointless doing it twice in one month. Your 15mile LSR will give you the confidence that you can run 13miles. Your Tempo run will give you confidence that you can sustain HMP for a long period. Your speed sessions will build your threshold.
What pace are you running 10miles at? If you're running it at LSR pace then you're doing lots more miles than you need to. If you're running it quicker you run the risk or burning out after a few weeks.
At our age we take longer to recover even if you don't feel that it does.
Have a read of this thread: Training for the right Distance
Edited: 05/01/2013 at 13:46